add ui compare images and md

docs/compare_ui.md

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+## Compare UI
+
+| Offical Fenaka app | GridFlow light mode | GridFlow dark Mode |
+|--------------------|---------------------|--------------------|
+|![](images/fenaka_welcome.jpg)|![](images/gridflow_welcome_light.jpg)|![](images/gridflow_welcome_light.jpg)|
+|![](images/fenaka_register.jpg)|![](images/gridflow_register_white.jpg)|![](images/gridflow_register_dark.jpg)|
+|![](images/fenaka_resetpass.jpg)|![](images/gridflow_resetpass_white.jpg)|![](images/gridflow_resetpass_dark.jpg)|
+|![](images/)|![](images/)|![](images/)|
+|![](images/)|![](images/)|![](images/)|
+|![](images/)|![](images/)|![](images/)|
+|![](images/)|![](images/)|![](images/)|
+|![](images/)|![](images/)|![](images/)|
+|![](images/)|![](images/)|![](images/)|
+|![](images/)|![](images/)|![](images/)|